.overlay {
    position: absolute;
    top: 0px;
    left: 0px;
    z-index: 10001;
    background-color: #777;
    opacity: 0.5;
}

#welcome{
    z-index: 10002;
    text-align: center;
    margin-top:300px
}

#replay{
    z-index: 10002;
    text-align: center;
    margin-top:300px;
    display:none;
}

#main{
    margin:0;
    padding:0;
}